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import ExpoModulesCore
import UIKit
class SheetView: ExpoView, UISheetPresentationControllerDelegate {
// Views
private var sheetVc: SheetViewController?
private var innerView: UIView?
private var touchHandler: RCTTouchHandler?
// Events
private let onAttemptDismiss = EventDispatcher()
private let onSnapPointChange = EventDispatcher()
private let onStateChange = EventDispatcher()
// Open event firing
private var isOpen: Bool = false {
didSet {
onStateChange([
"state": isOpen ? "open" : "closed"
])
}
}
// React view props
var preventDismiss = false
var preventExpansion = false
var cornerRadius: CGFloat?
var minHeight = 0.0
var maxHeight: CGFloat! {
didSet {
let screenHeight = Util.getScreenHeight() ?? 0
if maxHeight > screenHeight {
maxHeight = screenHeight
}
}
}
private var isOpening = false {
didSet {
if isOpening {
onStateChange([
"state": "opening"
])
}
}
}
private var isClosing = false {
didSet {
if isClosing {
onStateChange([
"state": "closing"
])
}
}
}
private var selectedDetentIdentifier: UISheetPresentationController.Detent.Identifier? {
didSet {
if selectedDetentIdentifier == .large {
onSnapPointChange([
"snapPoint": 2
])
} else {
onSnapPointChange([
"snapPoint": 1
])
}
}
}
private var prevLayoutDetentIdentifier: UISheetPresentationController.Detent.Identifier?
// MARK: - Lifecycle
required init (appContext: AppContext? = nil) {
super.init(appContext: appContext)
self.maxHeight = Util.getScreenHeight()
self.touchHandler = RCTTouchHandler(bridge: appContext?.reactBridge)
SheetManager.shared.add(self)
}
deinit {
self.destroy()
}
// We don't want this view to actually get added to the tree, so we'll simply store it for adding
// to the SheetViewController
override func insertReactSubview(_ subview: UIView!, at atIndex: Int) {
self.touchHandler?.attach(to: subview)
self.innerView = subview
}
// We'll grab the content height from here so we know the initial detent to set
override func layoutSubviews() {
super.layoutSubviews()
guard let innerView = self.innerView else {
return
}
if innerView.subviews.count != 1 {
return
}
self.present()
}
private func destroy() {
self.isClosing = false
self.isOpen = false
self.sheetVc = nil
self.touchHandler?.detach(from: self.innerView)
self.touchHandler = nil
self.innerView = nil
SheetManager.shared.remove(self)
}
// MARK: - Presentation
func present() {
guard !self.isOpen,
!self.isOpening,
!self.isClosing,
let innerView = self.innerView,
let contentHeight = innerView.subviews.first?.frame.height,
let rvc = self.reactViewController() else {
return
}
let sheetVc = SheetViewController()
sheetVc.setDetents(contentHeight: self.clampHeight(contentHeight), preventExpansion: self.preventExpansion)
if let sheet = sheetVc.sheetPresentationController {
sheet.delegate = self
sheet.preferredCornerRadius = self.cornerRadius
self.selectedDetentIdentifier = sheet.selectedDetentIdentifier
}
sheetVc.view.addSubview(innerView)
self.sheetVc = sheetVc
self.isOpening = true
rvc.present(sheetVc, animated: true) { [weak self] in
self?.isOpening = false
self?.isOpen = true
}
}
func updateLayout() {
// Allow updates either when identifiers match OR when prevLayoutDetentIdentifier is nil (first real content update)
if (self.prevLayoutDetentIdentifier == self.selectedDetentIdentifier || self.prevLayoutDetentIdentifier == nil),
let contentHeight = self.innerView?.subviews.first?.frame.size.height {
self.sheetVc?.updateDetents(contentHeight: self.clampHeight(contentHeight),
preventExpansion: self.preventExpansion)
self.selectedDetentIdentifier = self.sheetVc?.getCurrentDetentIdentifier()
}
self.prevLayoutDetentIdentifier = self.selectedDetentIdentifier
}
func dismiss() {
self.isClosing = true
self.sheetVc?.dismiss(animated: true) { [weak self] in
self?.destroy()
}
}
// MARK: - Utils
private func clampHeight(_ height: CGFloat) -> CGFloat {
if height < self.minHeight {
return self.minHeight
} else if height > self.maxHeight {
return self.maxHeight
}
return height
}
// MARK: - UISheetPresentationControllerDelegate
func presentationControllerShouldDismiss(_ presentationController: UIPresentationController) -> Bool {
self.onAttemptDismiss()
return !self.preventDismiss
}
func presentationControllerWillDismiss(_ presentationController: UIPresentationController) {
self.isClosing = true
}
func presentationControllerDidDismiss(_ presentationController: UIPresentationController) {
self.destroy()
}
func sheetPresentationControllerDidChangeSelectedDetentIdentifier(_ sheetPresentationController: UISheetPresentationController) {
self.selectedDetentIdentifier = sheetPresentationController.selectedDetentIdentifier
}
}
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